Rear drum brake problems.

Rebuilt booster from Dewey.new master cylinder prop valve combo from pirate jacks.master cylinder and lines all bled no air bubbles front discs work fine.very soft pedal car on Jack stands put car in gear back brakes not working what could it be that's causing this problem prop valve is adjusted.

Did you get fluid out of rear brake cylinders when bleeding? Sounds obvious but have to start somewhere.

Brakes! Yeah you have to start the tracing somewhere. Unless you have a line pressure gauge, it's not a sure bet on prop valve adjustment other than doing a test. One thing is to assure you have the rear shoes adjusted properly - they should have a light drag to the drums adjusting the star wheel. Make sure the locking lever is properly aligned to the wheel...and obvious the brakes are installed correctly if you had them out. Other demons can be the T-block on the rear axle requiring cleaning or replacement. The rear rubber line should be in good condition...those can deteriorate and balloon out when applying the brakes. Another issue is assuring proper gap btw the booster and MC rod...yeah - there's more but see what you come up with so far.

Nick ciavarino said:

No just a normal bleed.

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A normal bleed should obtain brake fluid flowing out of the cylinders...

Ron H said:

A normal bleed should obtain brake fluid flowing out of the cylinders...

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Yes

Put the rear on jack stands and take your rear wheels off. Pull your drum off the hub just enough to to view the rear wheel cylinders. Have someone press the brake pedal while you check for movement. Also, check your drum backing plates for a wear groove where the brake shoe hits the backing plate. Sometimes there is enough wear to hinder the shoes movement. If they are not moving, replace the rear brake hose.
Ron